how to measure your window for blinds

Not sure what to do? Follow our instructions below which will walk you through step by step on choosing the preferred blind fit and obtaining an accurate measure of your window. If you have any questions or are unsure of anything, please contact us so we can assist you. 

Or if you prefer we can send one of our in-home consultants to come and discuss blind options and measure for you.

determine inside fit or outside fit blind

Your blinds can be fitted either inside the window frame (‘inside fit’) or on the outside of the window on the wall or architrave (‘outside fit’).

how to measure your window for an inside fit blind

An inside fit blind is the most common option chosen as it provides a clean sleek look sitting within the window frame at all times.

how to measure your window for an outside fit blind

Your blind can also be made to fit outside the window frame fixing to the wall (i.e. above the window frame) or architrave.

where to fit your blinds - inside or outside the frame

how to get the right measurement

  • take all measurements to the nearest millimetre – do not round off your measurements
  • take all measurements twice ensuring that you get the same result each time

Your blinds can be fitted inside the window frame (‘inside fit’) or on the outside of the window on the wall or architrave (‘outside fit’).

Inside fit is the most common option chosen as it provides a clean look that is more aesthetically appealing than an outside fit.  It does, however, allow some light to get past the outside edges of the blind.  If desired this can be minimised by setting the blind further back into the window frame.

Before deciding on an inside fit also ensure that the window frame is deep enough to fit the blind and brackets.  A guide to the required window frame depth for the blind to fit inside the frame is as follows:

blind type reveal depth blind fit
single roller blind greater than 75mm fully inside frame
50 to 75mm partially outside frame
dual roller blind greater than 130mm fully inside frame without double brackets
115 to 130mm fully inside frame with double brackets
75 to 115mm one blind will fit partially outside the frame
50mm venetian blind (wood or synthetic) greater than 70mm fully inside frame
40 to 70mm partially outside frame

Note: discuss the need for facia returns with our sales team.

25mm aluminium venetian blind greater than 30mm fully inside frame
vertical blind greater than 100mm fully inside frame
between 75 to 100mm vanes will sit partially outside the frame
40 to 75mm partially outside the frame

Note: discuss the need for extended brackets with our sales team.

Check your windows for any obstacles that may impede the smooth operation of a blind such as handles, latches or mullions (wood or aluminium vertical divider between windows). Be especially careful in the case of sliding doors.

Outside fit is where the blind is fitted on the outside of the window frame on the wall or architrave. This option is less common however you may wish to select this option based on the following:

  •  A particular look you are trying to achieve
  • Blocks more light as the blind covers the full face of the window
  • The window frame is not deep enough to hold the blinds in the case of an inside fit (see above)
  • There are obstacles in the window frame that the blinds might hit (see above)
  • The window itself may not be a regular shape

measuring technique for inside fit roller blind

width measurement

drop measurement

Do not make any adjustments or deductions to these measurements.

roller blind corner window measuring instructions

Here are some printable instructions should you require blinds for a corner window.

measuring technique for inside fit venetian and vertical  blinds

width measurement

drop measurement

  • Measure the inside height of the window frame (‘drop’) in three places – left, right and centre of the window frame (see figure 2)
  • Note down the smallest measurement of the three on the self measureself install page or the printable blind measuring sheet. 

Do not make any adjustments or deductions to these measurements.

how to measure your window for an inside fit blind

how to measure your window for an inside fit blind

how to get the right measurement

  •  Take all measurements to the nearest millimetre – do not round off your measurements
  • Take all measurements twice ensuring tht you get the same result each time

measuring technique for inside fit roller blind

width measurement

  • Measure the inside width of your window frame across the very top of the frame (‘width’) (see figure 1)
  • Note this measurement down on the blind measuring sheet

drop measurement

  • Measure the inside height of the window frame (‘drop’) (see figure 1)
  • Note this down on the blind measuring sheet. Measure the inside height of the window frame (‘drop’) in three places – left, right and centre of the window frame (see figure 2) Do not make any adjustments or deductions to these measurements venetian and vertical blinds

measuring technique for inside fit venetian and vertical  blinds

width measurement

  • Measure the inside width of your window frame across the very top of the frame (‘width’) (see figure 2)
  • Note this measurement down on the blind measuring sheet

drop measurement

  • Measure the inside height of the window frame (‘drop’) in three places – left, right and centre of the window frame (see figure 2)
  • Note down the smallest measurement of the three on the blind measuring sheet

Do not make any adjustments or deductions to these measurements.

fig 1: measuring your window for an inside fit roller blind

fig 2: measuring your window for an inside fit venetian or vertical blind

fig 3: measuring your window for outside fit – fixed to the wall

fig 4: measuring your window for outside fit – blind fixed to the architrave

how to measure your window for an outside fit blind

measuring technique for an outside fit blind 

Before measuring the window for an outside fit you need to decide how you are going to fit the blinds which will in part depend on the style of your window frames:

  • If your windows do not have architraves then the blinds will generally be fitted to the wall above the window frame (so the screws can fix into the lintel behind your gib)
  • If your windows have architraves you may either fix the blind brackets to the outside edges of the architraves or to the wall above the architraves

If you decide to fix the blind brackets to the architraves note that the width of the actual blind will be slightly less than the width of the architraves, hence some of the architrave will show when the blind is down / closed.

measuring outside fit – blind fixed to the wall

To measure an outside fit where the blind is to be fixed to the wall (i.e. above the window frame or architrave) carry out the following steps:

width measurement

drop measurement

measuring outside fit – blind fixed to the architrave

To measure an outside fit where the blind is to be fixed to the architrave, measure the outside width of the window architrave (‘width’) and the outside height of the architrave (‘drop’) (see figure 4).

Note these measurements down on the self measureself install  page or the printable blind measuring sheet. 

Do not make any adjustments or deductions to these measurements.

Please take care when measuring your windows making sure that your measurements are accurate.  If you make a mistake we may not be able to alter your blinds and may have to remake them.  You will also have to pay for the cost of any remade blinds and possibly incur further freight charges

important note

important note

Please take care when measuring your windows making sure that your measurements are accurate.  If you make a mistake we may not be able to alter your blinds and may have to remake them.  You will also have to pay for the cost of any remade blinds and possibly incur further freight charges

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Proudly located at the business capital of the country Auckland, we provide blinds nationwide in New Zealand servicing residential and commercial customers.

new zealand wide shipping

New Zealand wide shipping

We ship our window blinds throughout New Zealand from our Auckland manufacturing facility.

3 year warranty

five year warranty

Buy blinds with confidence as all blinds come with a 5 year warranty on fabrics, and a 3 year warranty on parts and workmanship.

easy installation

easy installation

All our blinds are easy to install and come with installation instructions, however, if you need further information regarding measuring or fitting your blinds then view our ‘how to’ page or contact us to find out how we can help.

free sample service

free sample service

From versatile dual roller blinds to our affordable vertical blind options, we're happy to send colour samples for all of our blinds anywhere in the country for FREE.

best price guarantee

best price guarantee

We guarantee not to be beaten on price. If you find a better price for the same product then we will beat it. You will receive quality custom blinds made specifically to your requirements for the best price.